Oops, it doesn't look like 'behave like a pirate day' is a national day..

Other days

martini

Martini Day
lost sock memorial

Lost Sock Memorial Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
bonang

Bonang Day
bow tie

Bow Tie Day
eat what you want

Eat What You Want Day
get funky

Get Funky Day
kale

Kale Day
tell a fairytale

Tell A Fairytale Day
stud

Stud Day